Seeing the frightening tiger, all the people _____.[ ]

A. took deep breath                              

B. out of breath

C. lost a deep breath                        

D. held their breath

大型房间隔缺损后期出现青紫时肺血管的改变是

A．肺血增多

B．梗阻型肺动脉高压

C．肺门阴影缩小

D．动力型肺动脉高压

E．肺动脉痉挛